因式分解-12x次方y x3次方 36xy次方
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x³-13x-12=x³-x-12x-12=x﹙x²-1﹚-12﹙x+1﹚=x﹙x-1﹚﹙x+1﹚-12﹙x+1﹚=﹙x+1﹚﹙x²-x-12﹚=﹙x+1﹚﹙x
x³-y³=x³-x²y+x²y-xy²+xy²-y³=x²(x-y)+xy(x-y)+y²(x-y
x^4+x^3-2=x^4-x^3+2x^3-2=x^3(x-1)+2(x^3-1)=x^3(x-1)+2(x-1)(x^2+x+1)=(x-1)[x^3+2(x^2+x+1)]=(x-1)(x^3+
原式=(x²-y²)²=(x+y)²(x-y)²
x^8+x+1=(x^8-x^2)+(x^2+x+1)=x^2(x^6-1)+(x^2+x+1)=x^2(x^3-1)(x^3+1)+(x^2+x+1)=x^2(x-1)(x^2+x+1)(x^3+1
x^3-x=x(x^2-1)=x(x+1)(x-1)
x8+x7+x6-x7-x6-x5+x5+x4+x3-x4-x3-x2+x2+x+1,每3项合并即可(x²+x+1)
根据x^n-1=(x-1)(1+x+x^2+..+x^(n-1))得原式=(x^18-x^3)/(x^3-1)+23=(x^18+22x^3-23)/(x^3-1)
x^3-x=x(x^2-1)=x(x+1)(x-1)
提3x,得3x(1-4x^2)平方差公式的运用3x(1+2x)(1-2x)
X的6次方-Y的6次方=(X的3次方+Y的3次方)(X的3次方-Y的3次方)=(X+Y)(X²-XY+Y²)(X-Y)(X²+XY+Y²)
(x2+y2)(x+y)(x-y)
-36x^2+12xy-y^2=-(36x^2-12xy+y^2)=-(6x+y)^2
x的4次方-16x的2次方=﹙x²﹚²-﹙4x﹚²=﹙ײ+4x﹚﹙x²-4x﹚
x^2-7x+12=(x-3)(x-4)
X^8+X^7+1=X^8+X^7+X^6-X^6+1=X^6(X^2+X+1)-(X^6-1)=X^6(X^2+X+1)-(X^3+1)(X^3-1)=X^6(X^2+X+1)-(X^3+1)(X-
-2x的平方-12xy的2次方+8xy的3次方=-2x(x+6y²-4y³)
3x^(2n-1)-12x^(2n+1)=3x^(2n-1)(1-4x^2)=3x^(2n-1)(1+2x)(1-2x)
X^3-9x=x(x^2-9)=x(x+3)(x-3)